The document provides an overview of Internet Protocol (IP) addressing and the role of the American Registry for Internet Numbers (ARIN) and other Regional Internet Registries (RIRs). It discusses IP addresses and autonomous system numbers, the domain name system, IP address allocation and management, and the purpose of WHOIS directories. ARIN is responsible for managing IP address space and ASNs in its service region, which includes Canada, the US, and many Caribbean islands.

1. Internet Operations
and
the RIRs
3 February 2011

2. Overview
• ARIN and the Regional Internet Registry
(RIR) System
• IP Number Resources, DNS and Routing
• IP Address Management
• Whois

3. ARIN and the RIR System

4. About ARIN
• One of five Regional Internet Registries
• Issues Internet number resources; facilitates consensus
based policies and promotes the advancement of the
Internet through education and outreach
• Services 25 Economies in the Caribbean and North
America
• Nonprofit corporation based in
Chantilly, VA, established December 1997
• 100% community funded

5. Regional Internet Registries

6. ARIN’s Service Region
ARIN’s region includes Canada, many Caribbean and
North Atlantic islands, and the United States.

7. Not-for-profit
Membership
Organization
Community
Regulated
• Fee for services,
not number
resources
• 100% community
funded
• Open
• Broad-based
- Private sector
- Public sector
- Civil society
• Community
developed policies
• Member-elected
executive board
• Open and
transparent
RIR Structure

8. Number
Resources
Organization
Policy
Development
• IP address
allocation &
assignment
• ASN assignment
• Directory
services
• Whois
• IRR
• Reverse DNS
• Elections
• Meetings
• Information
dissemination
• Website
• Newsletters
• Roundtables
• Training
• Maintain e-mail
discussion lists
• Conduct public
policy meetings
• Publish policy
documents
RIR Services

9. Internet Operations

10. 193.0.0.131
196.216.2.1
192.149.252.7
200.160.2.15
202.12.29.20
192.0.0.214
206.131.253.68
192.0.34.163
On the Internet, you are nothing but
an IP address!
202.12.29.142
www.nro.net
www.afrinic.net
www.arin.net
www.lacnic.net
www.apnic.net
www.ripe.net
www.isoc.org
www.icann.org

11. What is an IP Address?
An Internet Protocol (IP) address is a
number that identifies a device on a
computer network.
– Every device directly connected to the
Internet needs a unique IP address
– There are two types of IP addresses – IPv4
and IPv6

12. Quick History of the Internet Protocol
• Internet Protocol version 4 (IPv4, or just “IP”)
– First developed for the original Internet (ARPANET) in spring 1978
– Deployed globally with growth of the Internet
– Total of 4 billion IP addresses available
– Used by every ISP and hosting company to connect customers to the
Internet
– Allocated based on documented need
• Internet Protocol version 6 (IPv6)
– Design started in 1993 when IETF forecasts showed IPv4 depletion
between 2010 and 2017
– Completed, tested, and available for production since 1999
– Total of 340,282,366,920,938,463,463,374,607,431,768,211,456 IP
addresses available
– Used and managed similar to IPv4

13. About IPv4 and IPv6
Internet Protocol
version 4 (IPv4)
Internet Protocol version
6 (IPv6)
Deployed 1981 1999
Address Size 32-bit number 128-bit number
Address Format Dotted Decimal
Notation:
192.149.252.76
Hexadecimal Notation:
3FFE:F200:0234:AB00:0
123:4567:8901:ABCD
Prefix Notation 192.149.0.0/24 3FFE:F200:0234::/48
Number of Addresses 232 =
~4,000,000,000
2128 = ~340,000,000,
000,000,000,000,000,
000,000,000,000,000

14. IPv4 Depletion is Imminent
• 5 RIRs together have been allocating, on average,
10-12 /8s each year
• Demand for IPv4 continues from organizations
around the world
• IANA has issued eight /8s to the 5 RIRs in 2010
• There are 18 /8s remaining at the IANA
as of 31 May 2010
• IANA IPv4 free pool depletion COULD happen in
early 2011

15. What is a Domain Name?
A domain name is label that a
person uses in place of an IP
address to locate a site on the
Internet, like www.arin.net.

16. What is the Domain Name
System (DNS)?
The Domain Name System (DNS)
is a way to store and retrieve
information about domain names
and IP addresses.

17. IP Addresses are Not Domain Names
• IP Address [Identifier]
– “Computer-friendly”
– Unique number identifies computer on Internet
– Used for routing (moving information across an inter-network
from a source to a destination)
• DNS Name [Reference]
– “People-Friendly”
– Maps host name to unique IP address
– A means of storing and retrieving information about
hostnames and IP addresses in a distributed data
base

18. The Internet
2001:0C00:8888::
My Computer
www.cernet.cn?
Using Domain Names
DNS
1. My Computer asks the
DNS where to find
www.cernet.cn

19. The Internet
2001:0C00:8888::
My Computer
202.112.0.46
2001:0400::
Using Domain Names
DNS
2. The DNS provides the
IPv4 or IPv6 address for
the requested URL.

20. The Internet
2001:0C00:8888::
My Computer www. cernet.cn
2001:0400::
202.112.0.46
2001:0400::
Using Domain Names
DNS
3. My Computer queries
the appropriate server
for the IP address
provided by the DNS.

21. What is an Autonomous System
Number (ASN)?
• A globally unique number (16 or 32 bit) used by
routing protocols (like BGP) to identify an
autonomous system (a connected group of IP
networks that adhere to a single, clearly defined
routing policy)
–4,294,967,296 AS numbers (or 232)
–e.g. 36863 (16 bit), 393225 (32 bit)

22. What is Routing?
Routing is the act of moving
information across an internetwork
from a source to a destination.

23. Network
Instead, the computers can connect to a single
router.
Router

24. Six computers need to
communicate with each
other.
Point-to-Point Networking

25. Each computer
communicates with the
other computers on its
network, creating a total of
15 connections.
Point-to-Point Networking

26. On a larger network,
individual connections
become unmanageable.
Point-to-Point Networking

27. Interconnected Networks
Each network
can link to other
networks via its
router.

28. Interconnected Networks
Each network
can link to other
networks via its
router.
172.25.1.4 192.23.9.6
201.32.16.10
Each segment receives
IP addresses.
163.37.56.21
172.25.1.4 192.23.9.6
201.32.16.10 163.37.56.21

29. Administrative Grouping
172.25.1.4 192.23.9.6
201.32.16.10
163.37.56.21
Groups of devices
with a single,
clearly defined
routing policy may
be assigned an
Autonomous
System Number
(ASN).

30. Administrative Grouping
172.25.1.4 192.23.9.6
201.32.16.10
163.37.56.21
AS 1234 AS 2345
AS 3456
Registries provide
Internet number
resources to help
divide internetworks
into interconnected,
autonomous groups
of devices.

31. The Internet
Internet Address Routing
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
…
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
…

32. The Internet
Announce
202.12.29.0/24
Internet Address Routing
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
…
202.12.29.0/24
1. The network
announces an IP
address range.
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
…

33. The Internet
Announce
202.12.29.0/24
Internet Address Routing
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
…
202.12.29.0/24
2. The range is
added to a
specific table
within a router.
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
202.12.29.0/24
…

34. The Internet
Traffic
202.12.29.0/24
Internet Address Routing
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
…
202.12.29.0/24
3. The router can
redistribute
information to
devices within
the network.
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
202.12.29.0/24
…

35. Internet Address Routing
Traffic
202.12.29.142
Routing Table
202.12.29.0/25
202.12.29.128/25
Local Router
202.12.29.142
202.12.29.0/24
1. Traffic enters the network according to the
routing table.

36. Internet Address Routing
Traffic
202.12.29.142
Routing Table
202.12.29.0/25
202.12.29.128/25
Local Router
202.12.29.142
202.12.29.0/24
2. The local router directs traffic to the appropriate
device according to its own routing table.

37. Global Internet Routing
Network
Network
Network
Network
Network
Network
Network
Network
Network
Network
Network

38. Global Internet Routing
Network
Network
Network
Network
Network
Network
Network
Network
Network
Network
Network
Internetwork
Routing Table
4.128/9
60.100/16
60.100.0/20
135.22/16
…
With a coordinated numbering system, you can build a network of
networks.

39. IP Address Management

40. Terms
• Allocate
– to issue number resources to ISPs (LIRs) for
internal networks and for further sub-delegation to
customers
• Assign
– to issue number resources to end-users for internal
networks only
• Legacy Space
– Numbering resources issued prior to the
establishment of the RIRs
• Issued without a contract
• Currently maintained and updated by ARIN
• Honeypot for criminality

41. Who are the Provisioning Organizations?
ICANN
IANA
• Top level technical coordination of the Internet
(Names, Numbers, Root Servers)
• Manage global unallocated IP address pool
• Allocate number resources to RIRs
RIR • Manage regional unallocated IP address pool
• Allocate number resources to ISPs/LIRs
• Assign number resources to End-users
ISP/LIR
• Manage local IP address pool for use by
customers and for infrastructure
• Allocate number resources to ISPs
• Assign number resources to End-users

42. Number Resource Provisioning Hierarchy
ICANN / IANA
(Internet Assigned Numbers Authority)
Manage global unallocated IP address pool
ISPs
End UsersISPs
RIRs
(AfriNIC, APNIC, ARIN, LACNIC, RIPE NCC)
Manage regional unallocated IP address pool
Re-Allocate Re-Assign
End Users
Allocate
Allocate Assign

43. Data Verification
• Orgs and POCs registered first
– All new Orgs vetted and authenticated
• Secretary of State websites
• Westlaw
• SEC
• Legal documents
• Organizations making modifications
vetted every 12 months

44. What is WHOIS?
• A general purpose registry directory
service
• Serves a variety of purposes:
– Number Registry
– Name Registry
– Routing Registry
• Differs in usage and content depending on
registry

45. • Registration information about
– IP addresses and AS numbers issued by ARIN
– IP addresses and AS numbers issued by the
Central Registry (pre-RIR or legacy)
– Organizations that hold these resources
(ORGs)
– Points of Contact (POCs) for resources or
organizations
– Reallocated/reassigned networks
(from ISPs to customers)
What’s in ARIN’s Whois?

46. What’s not in ARIN’s Whois?
• Information about
– Domain names
– Host names
– Reassignments/reallocations by ISPs using their own
Whois servers (called RWHOIS)
– Military networks (see http://www.nic.mil)
• Routing information
• Geographic location of the network
– Addresses shown not necessarily the physical location of
the resource

47. Whois Tips
• Data not always accurate
– Registrants responsibility to update
– Legacy space rarely updated
• Not all customer reallocations/reassignments in
Whois
– Those smaller than /29 (generally)
– Those registered in RWHOIS server
– Private residence info not shown
• If you need data not shown in Whois, may need
subpoena

48. What Other Information Might ARIN
Have?
• Information about about an organization’s network
– Peering or exchange points to which the network may directly
connect
– An organization’s internal utilization information
– IP ranges utilizing specific types of services, e.g., DSL, webhosting,
dial-up, etc.
• Historical Data
– Previous Points of Contact for the network
– Address ranges an organization may have renumbered out of and
returned to ARIN
– Previous address registrants subsequent to a transfer or merger
• More detailed reassignment information
• Financial transaction records and billing POCs
• Corporate papers and list of officers

49. Useful Links

50. RIR’s Whois
• ARIN
http://whois.arin.net/ui/
• AfriNIC
http://www.afrinic.net/cgi-bin/whois
• APNIC
http://www.apnic.net/search/index.html
• LACNIC
http://lacnic.net/cgi-bin/lacnic/whois
• RIPE NCC
http://www.ripe.net/perl/whois

51. Number and Name Lookup
Services
• Domain registries
http://www.iana.org/gtld/gtld.htm
http://www.iana.org/cctld/cctld-whois.htm
• GeekTools
http://www.geektools.org/whois.php

52. Routing
Information
• Route Views
http://www.routeviews.org
• RIS
http://www.ripe.net/projects/ris/index.html
• Looking glass information
http://www.caida.org/analysis/routing/reversetrace/
• Blacklisting
http://www.mxtoolbox.com/blacklists.aspx

53. Questions?